this product is a triple-action formula, providing a crabgrass preventer, lawn fertilizer and broadleaf weed kill in 1-single lawn application. Everything is rolled into 1 for the spring. In addition, the broadleaf weed control is effective on over 200 weeds as listed on the label. Crabgrass is prevented and destroyed up to 4-weeks after germination, so you apply it when the dandelions bloom. this formulation also features both immediate release and controlled-released nutrients that provide continuous feeding for up to 12 weeks. For use on established bahiagrass, bermudagrass, buffalograss, centipedegrass, fine fescues, Kentucky bluegrass, perennial ryegrass, tall fescues, and zoysiagrass.